Process of forming compositions of matter.



IUD- UUIVII'UOI I IUHD;

COATING OR PLASTIC- a, inc. 729,204.

UNITED STATES Patented May 26, 190.1?

PATENT OFFICE.

HANS MOLOHIN, OF ST. LOUIS, MISSOURI.

PROCESS OF FORMING COMPOSITlONS OF MATTER.

- SPECIFICATION forming part of Letters Patent No. 729,304, dated May26, 1908.

Application filed March 25,1903. Serial No. 149,486. (No specimens.)

To all whom it may concern.-

Be it known that I, HANS MOLCHIN, a citizen of the United States,residing at the city of St. Louis, State of Missouri, have inventedcertain new and useful Improvements in Processes of Forming Compositionsof Matter, of which the following is a specification.

This invention relates to processes for forming compositions of matterto be used in making fireproof brick for buildings, partitionwalls,linings of framework, and the like; and it consists of improvementswhereby such compositions are rendered tougher or capable of resisting agreater tensile strain and capable of greater fire resistance.

The composition consists of a close mixture of calcined gypsum orcalcium sulfate, which is ordinarily termed plaster-of-paris,coalcinders, mica, slaked lime, and silicate of soda.

The above-mentioned component parts of my new composition are commingledtogether in the following manner: First of all water is placed in a tankand three percent. of dissolved lime is poured into it. Then enoughplaster-of-paris mixed with mica is put in the water to make a clingingmass. To this mass is added sifted cinders of bituminous or anthracitecoal, said cinders being graded either fine or coarse, according to thesize of the bricks to be formed of the composition. Beaten or pulverizedbrick may also be used instead of the coal-cinders. The composition isthen stirred rapidly, so that the different elements hereinbefore setforth will be quickly mixed. The mixture at this point is almost readyto be poured into the molds, but before doing so it is necessary to addjust before the mixture is put in the molds a suitable amount ofsilicate of soda or other ingredient having like properties. It isimportant to add the silicate of soda in such proportions as to secureits beneficial effects in the composition and to make the resultingproduct mosteflicient, and at the same time not to put so much silicateof soda in the mixture as to make it non-a esive or its product brittle.Without the silicate of soda in the composition it is open to theobjection of being too porous, which causes it to be absorbent of waterto an undesirable degree, whichinjures the practical value of thecomposition when used as a building material exposed to the weather. Theaddition of silicate of soda to the composition makes it more dense andimpervious to water and increases its capacity for withstanding theweather.

The plaster-of-paris in the composition makes it set and adapts it to bemolded. The sifted cinders, pulverized brick, crushed coke, or similarporous article makes the material iucombustible, strong, tenacious, andone which is bound closely together in all its parts, because theplaster is absorbed into the pores of the cinders or similar ingredient.The mica is unburned ground mica and is introduced for the purpose ofincreasing the fireproof character of the composition.

The proportions that I have found practical and to give the best resultsin the making of my said composition are as follows: forty-five parts,by weight, of laster-ofarisfifty parts, by weight, of Warts, by weight,of micathree parE, by weight, of slaked lime.

e s1 mate of soda when purchased in the marke ty-slx per cent.chemically pure is added to the foregoing mixture in the proportion of.002 per cent. to the entire mass. In order that the silicate of sodamay be mixed quickly with the parts of the composition previouslycompounded, so as not to allow them to set and so as to intermingle thesilicate of soda with all parts of the composition, I prefer to mix thesilicate of soda with water 8 in a vessel in the proportion of one partof silicate of soda to seven parts of water and en quic y o stir sameinto the mass. After the silicate of soda is added to the compositionthe composition is poured into suitable molds or frames, and thecontents of these molds or frames is then exposed to the atmosphere.

The slabs or blocks of the fireproof material formed of the foregoingcomposition have such consistency as to allow of their being nailed towooden framework without splitting or breaking, and thus form asubstitute for iron sheathing.

What I claim is- The herein-described process of forming fireproofblocks or bricks consisting of mixing dissolved lime with water in areceptacle; and seventh, exposing same to the atmos- IO second, mixingcomminuted mica with plas- .phere to set. ter-of-paris and placingenough of same in" In testimony whereof I have alfixed my sigthe waterto form a clinging mass; third, nature, in presence of two witnesses,this 23d 5 adding a porous material like sifted coal-cinday of March,1903.

ders; fourth, mixing said ingredients; fifth, HANS MOLGHIN. addingthereto silicate of soda in the propor- Witnesses:

tion of .002 per cent. to the whole; sixth, MAUD E. LETCHER, pouring theentire composition into molds; HUGH K. WAGNER.

